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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will
get over heated.
make noise.
not run.
run normally.
get over heated.
make noise.
not run.
run normally.
Answer
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Related Question
Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?
Sandwiched lv and hv discs on each core limb
Half lv inside and half hv outside on each core limb
Half hv inside and half lv outside on each core limb
Lv on one core limb and hv on the other
Sandwiched lv and hv discs on each core limb
Half lv inside and half hv outside on each core limb
Half hv inside and half lv outside on each core limb
Lv on one core limb and hv on the other
Answer
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Electrical Machines
Commutators in DC machines have a role of which converts
Both AC to DC and DC to AC.
high voltage DC to low voltage DC.
none of these.
AC to DC.
Both AC to DC and DC to AC.
high voltage DC to low voltage DC.
none of these.
AC to DC.
Answer
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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be
locking.
crawling.
plugging.
cogging.
locking.
crawling.
plugging.
cogging.
Answer
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Electrical Machines
The current drawn by a DC motor at the time of starting is
Zero.
Very high.
Very low.
Normal.
Zero.
Very high.
Very low.
Normal.
Answer
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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?
1037.5 r.p.m.
1130 r.p.m.
4575.4 r.p.m.
963.8 r.p.m.
1037.5 r.p.m.
1130 r.p.m.
4575.4 r.p.m.
963.8 r.p.m.
Answer
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